Inspirations First Contact is a major inspiration for how the dimensions work here. Read it. It's good. Dimensions Realspace Realspace is the normal universe that you know and probably hate. Bluespace Bluespace is a strange realm where the rules of Realspace are... more like suggestions.

Suit Tiers Softsuits A softsuit is the minimum possible safe amount of material to keep someone pressurised in space. It has relatively high mobility, but has insignificant protection. Also, because of this minimalist design, it's very compact and can be folded safely into a box. Hardsuit A hardsuit is body armor with the pressurising layer of a softsuit, allowing safe movement in space and protection from the dangers of the void. It has moderate mobility and considerable protection. While slow, movement speed can be improved with the addition of assistor motors that require electric charge. Due to the rigid armor, it takes up significant space and cannot be easily folded. Mechs Mechs are all protection, no speed. They have a lot of armor and provide serious protection, but move very slowly. Additionally, their considerable weight must be carried by electric motors, and so are vulnerable to running out of power or EMP. Also, don't even bother trying to put this thing in a box.

a shitty hackmd by veritius Changelings should be genuinely terrifying. Like, serious The Thing shit. A changeling should make the crew collectively shit its pants. Mechanics Biomass Drastic modifications (such as extruding chitin armor) should require biomass. Changelings obviously can't pull matter out of thin air (that's the job of a wizard), so it needs to get it from somewhere, right? And guess what's a great source of biomass - the crew. Undetectable A changeling in human form should be completely undetectable by reliable means. No technology can detect a changeling when it's trying to hide.

pAIs should be an in character source of information, replacing the need to use external sources such as a wiki or external map viewer. This encourages good roleplay through mechanics. It can also result in interesting RP where your staff head is alerted if your pAI looks up how to make illegal drugs or poisons (though this may need tweaking to be fair and fun) But pAIs' abilities shouldn't infringe on other jobs. No vital tracking (looking at you, TG) or magic scanner bullshit. If you start coughing blood, your first thought shouldn't be to ask your pAI what's wrong with you, but to go to Medical.